You may have posted an ad and then decided to edit for several reasons:
 

• Increase/decrease the price of the product
• Add more details about the product in title or description
• Change images
• Update location

 
Here’s what you need to do:
 

• Login and click your profile name on the top right side of the page.
• Select My Listings
• Make required edits
• Click on submit

 
Do remember to double-check your listing once you make an edit.